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>> i learned that he was arrested. i was shocked. i was so confused. i didn't think it was real. >> in the rarefied world of the ivy league, he was the total package. a star student, gifted athlete, wildly popular. >> he's one of the nicest guys ever! >> no one could understand how a weekend visit to his parents house -- >> did you say you heard a shot? >> yes. >> ended in gunfire. >> he's already dead. >> who's already did? >> my husband. >> charlie told officers outside, he was gonna kill my mom, i had to do it. >> yes. >> a brave son protecting his mom. a harrowing story, but was ...

>> yes. >> ended in gunfire. >> he's already dead. >> who's already did? >> my husband. >> charlie told officers outside, he was gonna kill my mom, i had to do it. >> yes. >> a brave son protecting his mom. a harrowing story, but was it true? >> he seated behind a desk? >> yes. >> defenseless really. >> this seems to be an execution. >> was this campus hero actually a cold hard killer? >> defendants is an email to his returning to others, called showtime? >> or was a true something completely different. >> one of the things that was always in question was, was charlie covering up for...

And his kids know he'll always be there for them. >> our rule is if you have a problem come in and we'll close the door. if you need somebody to talk to, we're here. >> now it was charlie who needed a shoulder or something. >> i said how are you doing. he said good, but he said, i can't make weightlifting on friday. and i said what's problem? he said i got to go home. >> clearly something was eating at the student. >> i asked if there was anything he wanted to talk about. he declined. he just said he had to get home. >> it wasn't spring break. classes were in session but charlie got in his car...

>> only charlie tan wasn't at all okay. it snowed that night, a muffling blanket, covering the home where something awful was about to happen. >> coming up, why did charlie need to rush home? the first clue coming from a friend's mom who called 911. >> he didn't give us a lot of details. i'm just worried that he might do something.

There is a softer side to this coach than drills and xs and os, and his kids know he'll always be there for them. >> our rule is if you have a problem come in and we'll close the door. if you need somebody to talk to, we're here. >> now it was charlie who needed a shoulder or something. >> i said how are you doing. he said good, but he said, i can't make weightlifting on friday. and i said what's problem? he said i got to go home. >> clearly something was eating at the student. >> i asked if there was anything he wanted to talk about. he declined. he just said he had to get home. >> it wasn't ...